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• W2017046268 abstract "Structural dynamics and volume were measured as a function of both temperature and pressure for a propylene glycol and its oligomers (PPG), and the results compared with previous data on higher molecular weight polypropylene glycols. PPG is of special interest because the terminal groups form hydrogen bonds; thus, by studying different molecular weights, the manner in which hydrogen bonding influences the dynamics in the supercooled regime can be systematically investigated. The fragility (Tg-normalized temperature dependence) of the dimer and trimer of PPG increases with pressure, similar to results for other H-bonded liquids, but different from van der Waals glass formers. This behavior is believed to be due to the effect of pressure in decreasing the extent of hydrogen bonding. From the combined temperature and volume dependences of the relaxation times, the relative degree to which thermal energy and volume govern the dynamics was quantified. With decreasing molecular weight, the relative contribution of thermal energy to the dynamics was found to strongly increase, reflecting the role of hydrogen bonding. By comparing the ionic conductivity and the dielectric relaxation times, a decoupling between rotational and translational motions was observed. Interestingly, this decoupling was independent of both pressure and molecular weight, indicating that hydrogen bonds have a negligible effect on the phenomenon." @default.
• W2017046268 created "2016-06-24" @default.
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• W2017046268 date "2003-11-21" @default.
• W2017046268 modified "2023-10-14" @default.
• W2017046268 title "Dielectric α-relaxation and ionic conductivity in propylene glycol and its oligomers measured at elevated pressure" @default.
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• W2017046268 doi "https://doi.org/10.1063/1.1624401" @default.
• W2017046268 hasPublicationYear "2003" @default.
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